CN101426154B - Outer cavity laser capable of being used as WDM-PON - Google Patents
Outer cavity laser capable of being used as WDM-PON Download PDFInfo
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- CN101426154B CN101426154B CN2008102367607A CN200810236760A CN101426154B CN 101426154 B CN101426154 B CN 101426154B CN 2008102367607 A CN2008102367607 A CN 2008102367607A CN 200810236760 A CN200810236760 A CN 200810236760A CN 101426154 B CN101426154 B CN 101426154B
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Abstract
The present invention relates to an external cavity laser based on semi-conductor gain medium as a WDM-PON, composed of an optical line terminal (OLT), a remote node (RN), an optical network unit (ONU) and fiber-optic transmission components, wherein, a passive module 1 is provided in the OLT, and a passive module 2 is provided in the RN; an external cavity laser is composed of the passive module 1, an DWDM wavelength-division multiplexer/demultiplexer 3 in the OLT and an OLT transceiver unit 5; and another external cavity laser is composed of the passive module 2, an DWDM wavelength-division multiplexer/demultiplexer 4 in the RN and an ONU emission unit 6 in the ONU. The light source adopted by the invention uses a module composed of passive devices to substitute expensive active device to realize the same function, which can greatly improve the reliability of the system and has reduced system cost, simple structure, easy and reliable use.
Description
Affiliated technical field
The invention belongs to Wave division multiplexing passive optical network (WDM-PON) technical field, be specifically related to a kind of outside cavity gas laser of based semiconductor gain media of the WDM-PON of can be used as light source.
Background technology
At present, EPON (PON) is the most attractive technology that solves Access Network " last kilometer ", realizes FTTX.PON can be divided into power Splittable EPON (PS-PON) and wavelength division multiplexing type EPON (WDM-PON) by the signal allocation mode.At present, APON, BPON, EPON, GPON all belong to PS-PON.WDM-PON is used in wavelength-division multiplex technique among the PON, the multi-wavelength signals that light wavelength division multiplexing sends optical line terminal (OLT) focuses on and is transferred to distant-end node (RN) in the optical fiber, utilizes the light wavelength division multiplexing of distant-end node (RN) that signal is assigned to each road optical network unit (ONU) according to the wavelength difference again.WDM-PON combines the advantage of WDM technology and PON topological structure, becomes a kind of high performance access way day by day.WDM-PON adopts the sign of wavelength as the user side optical network unit ONU, utilizes wavelength-division multiplex technique to realize up access, and the bandwidth of operation of broad can be provided, and can realize symmetrical broadband access truly.Simultaneously, can also avoid many technological difficulties such as range finding, the fast bit of ONU in the tdma be synchronous, and have clear superiority in network management and system upgrade aspect of performance.At present, the greatest difficulty of WDM-PON systems face is that device cost is too high, and majority still is in breadboard theoretical research stage.But the Korea S that has outstanding performance aspect optical access network begins test recently and tries on a small scale commercial WDM-PON system.Along with development of technology, the cost of wavelength division multiplexing optical device and active device descends significantly, and the WDM-PON technology will become the direction of PON Access Network development.
The greatest difficulty of WDM-PON systems face is that the active device cost is too high now, particularly OLT light source and ONU light source.
The OLT light source generally has following several:
1. one group of approaching, discrete, tunable Distributed Feedback Laser (dfb laser array) of wavelength utilizes thermal tuning to produce the downstream signal of multi-wavelength.The dfb laser array output spectrum can be unified tuning by the control temperature, realizes wavelength monitor easily, but because the Distributed Feedback Laser output wavelength changes with the waveguide effective refractive index, be difficult to accurately control output spectrum and lambda router channel spacing coupling.
2. adopt multifrequency laser (MFL).MFL is a kind of novel WDM laser based on integrated semiconductor amplifier and WGR (Waveguide Grating Router) technology, the array waveguide grating that comprises a N image intensifer and a 1x N, the integrated image intensifer of each input of array waveguide grating.
3. wavelength locking FP laser.Recently, adopted based on the WDM-PON system of wavelength locking FP laser and begun commercial.This system is the signal projector of FP laser as OLT and ONU.This scheme needs one or more high power wideband light sources that the input light of wavelength locking is provided for the FP laser.
The ONU light source generally has following several:
1. single frequency laser.At present, broad tuning single mode dfb laser array can meet the demands, but because cost an arm and a leg, still at the experimental stage, use apart from the marketization and to also have certain distance.
2. winding.Light winding technology is to utilize a part of downlink optical signal that OLT sends as carrier wave, modulates upward signal in ONU, re-sends to OLT.Light winding technology has been avoided use ONU light source, but also has some shortcomings.It requires the OLT light source output power very big, to support the up-downgoing transmission.Another shortcoming of winding is, the larger interference that causes for fear of the Rayleigh back scattering, uplink and downlink signals must be separated in the different optical fiber and transmit, cause number of fibers, router port quantity to be multiplied, the complexity of equipment installation and maintenance improves.
3. wide light source light spectrum is cut apart.Generally adopt narrow-band optical filter that the light source of wide spectrum is carried out frequency spectrum in the WDM-PON system and cut apart, make each WDM channel obtain unique light wave as last line light source.Frequency spectrum is cut apart the WDM-PON system and is adopted wideband light source (as LED, light-emitting diode), compares with the tunable single frequency laser, and wideband light source is simple, and cost is low, and is very attractive to the Access Network of cost sensitivity.The major defect that spectrum is cut apart is that frequency spectrum is cut apart and caused optical power loss very big, causes the power budget anxiety; Simultaneously, because the existence of the intrinsic several noises (mould distributed noise, intensity noise, optical beat noise) of multimode or wideband light source makes modulation rate limited.
4. wide light source+wavelength locking FP laser.The FP laser wants specialized designs to make injection locking wavelength and FP Wavelength matched.
5. wide light source+reflection type semiconductor image intensifer (RSOA).This scheme is to utilize wideband light source and wavelength division multiplexer that descending seed light is provided at the OLT end, and this seed light is amplified by RSOA at the ONU end, produces upward signal by modulation RSOA simultaneously.
In existing WDM-PON system, be many to adopt above-mentioned 4 and 5 schemes.In these two kinds of schemes, all must there be wideband light source or adjustable wavelength laser that seed light is provided at the OLT end.
Figure of description Fig. 1 is now typical WDM-PON system configuration schematic diagram.Form by optical line terminal (OLT), distant-end node (RN), optical network unit (ONU) and Transmission Fibers.Comprise one group of Transmit-Receive Unit, optical wavelength-division multiplex/demodulation multiplexer and wideband light source in the optical line terminal (OLT).The multi-wavelength signals that optical wavelength-division multiplex/demodulation multiplexer sends light source focuses on and is transferred to distant-end node (RN) in the optical fiber, utilizes the optical wavelength-division multiplex/demodulation multiplexer of distant-end node (RN) that signal is assigned to each road optical network unit (ONU) according to the wavelength difference again.General OLT end and ONU end utilize C-band and L-band wideband light source as seed light source respectively.The wavelength of supposing uplink and downlink is respectively λ u and λ d, and then λ u and λ d belong to L-band or C-band respectively.Wideband light source 1 is as the seed light source of ONU, and wideband light source 2 is as the seed light source of OLT.Require the spectrum of wideband light source to cover service band, power is enough greatly with excitation-emission unit Tx (semiconductor laser FP-LD or reflection type optical amplifier RSOA).
Summary of the invention
The objective of the invention is at active device ONU/OLT light source cost costliness in the WDM-PON system, be unfavorable for the WDM-PON system apply defective, a kind of outside cavity gas laser that adopts passive device to constitute is provided, realize colourlessization (colorless) of ONU/OLT light source among the WDM-PON in a kind of simple and practical mode, reduce the light source cost, promote the practicability of WDM-PON system.
Technical solution of the present invention is: a kind of outside cavity gas laser of the WDM-PON of can be used as light source, form by optical line terminal (OLT), distant-end node (RN), optical network unit (ONU) and Transmission Fibers, and in OLT and RN, establish passive module respectively.DWDM Wavelength division multiplexer/demultiplexer in passive module and the OLT and OLT Transmit-Receive Unit constitute outside cavity gas laser, and DWDM Wavelength division multiplexer/demultiplexer and the ONU transmitter unit in the ONU in passive module and the RN constitute outside cavity gas laser.
The improved WDM-PON system configuration of the present invention and Fig. 1 are basic identical, but OLT in two wideband light sources replaced by passive module, in RN, added a passive module.DWDM Wavelength division multiplexer/demultiplexer and n transmitter unit Tx in passive module and the OLT have constituted n outside cavity gas laser.And DWDM Wavelength division multiplexer/demultiplexer in passive module and the RN and m transmitter unit Tx in the ONU have constituted m outside cavity gas laser.
The following describes outside cavity gas laser principle of the present invention.
With an ONU unit is the outside cavity gas laser structure of the present invention of example.Passive module is made up of two identical wavelength division multiplex devices and a partial reflection part transmission device in the ONU unit, and partial reflection part transmission device is connected with optical fiber with wavelength division multiplex device with wavelength division multiplex device.The ONU transmitter unit is made of wavelength division multiplexer, ballistic device and detector, and the formation single fiber bi-directional transmitting-receiving unification device that is packaged together.Three wavelength division multiplex devices all are the wavelength division multiplexers that C-band and L-band light signal are separated, and their effect is with upward signal and downstream signal separately or close ripple.Wherein two wavelength division multiplex device pairings in the passive module are used, so that add the saturating device of the anti-part of part on up light path, and downstream signal are not changed.The saturating device of the anti-part of part is meant that the light to upward signal wave band λ u has the function of partial reflection part transmission.
After downstream signal λ d enters passive module, behind first wavelength division multiplex device, separate without same optical fiber, by behind second wavelength division multiplex device, DWDM Wavelength division multiplexer/demultiplexer, the 3rd wavelength division multiplex device, enter detector again with upward signal λ u.Detect downstream signal by detector and demodulator circuit.
In passive module on the upward signal λ u light path, we have added an optical device to the transmission of λ u partial reflection part, optical device with ballistic device, generally adopts reflection type semiconductor image intensifer (RSOA) to constitute resonant cavity as the outgoing chamber face of outside cavity gas laser like this.The DWDM Wavelength division multiplexer/demultiplexer then becomes the modeling element of resonant cavity, and its wavelength has determined the excitation wavelength of this outside cavity gas laser, and SOA becomes the gain media of resonant cavity.Under the condition of this outside cavity gas laser parameter of appropriate design, can realize penetrating like this by the DWDM wavelength of Wavelength division multiplexer/demultiplexer decision is sharp.Can realize the modulation and the generation of upward signal by changing the RSOA electric current.Upward signal enters Transmission Fibers from partial reflection part transmission device output back by first wavelength division multiplex device and is up to the OLT unit.
The above is to be example with an ONU unit.In fact, how many passages the DWDM Wavelength division multiplexer/demultiplexer has link to each other with the RSOA of ONU unit, just can produce the upward signal of what DWDM wavelength.
The light source of OLT end also can be realized by similar structures.Just the outside cavity gas laser that forms at the wave band difference.The ONU light source produces the laser of λ u, and the light source of OLT end produces the laser of λ d.
The invention has the beneficial effects as follows: the light source that the present invention adopts utilizes a module that is made of passive device, this passive module can be placed directly in OLT terminal or distant-end node RN place, combine the formation outside cavity gas laser with transmitter unit or the ONU unit of OLT, can save two high power wideband light sources that are used to provide seed light.The stability of passive device is better than the active device, replaces expensive active device to realize identical functions with passive device, can improve the reliability of system greatly, and reduces system cost.The present invention adopts existing ripe passive device technology, and is simple in structure, easy to use and reliable.
Description of drawings
Fig. 1: existing typical WDM-PON system configuration schematic diagram
Fig. 2: WDM-PON system configuration schematic diagram of the present invention
Fig. 3: ONU end light-source structure schematic diagram
Fig. 4: OLT end light-source structure schematic diagram
Among the figure: DWDM Wavelength division multiplexer/demultiplexer in the passive module in the passive module in the 1.OLT, 2.RN, 3.OLT, 4.ONU interior DWDM Wavelength division multiplexer/demultiplexer, 5.OLT Transmit-Receive Unit, 6.ONU transmitter unit, 7. first wavelength division multiplex device, 8. second wavelength division multiplex device, 9. partial reflection part transmission device, 10.ONU the 3rd wavelength division multiplexer, 11.ONU ballistic device, 12.ONU detector, 13.OLT the 3rd wavelength division multiplexer, 14.OLT ballistic device, the 15.OLT detector.
Embodiment
The present invention is described further below in conjunction with accompanying drawing:
Fig. 2 is an improved WDM-PON system configuration of utilizing light source of the present invention.A kind of outside cavity gas laser that can be used as the WDM-PON light source is made up of optical line terminal (OLT), distant-end node (RN), optical network unit (ONU) and Transmission Fibers, establishes passive module 1 in OLT, establishes passive module 2 in RN; Passive module 1 and interior DWDM Wavelength division multiplexer/demultiplexer 3 and the OLT Transmit-Receive Unit 5 formation outside cavity gas lasers of OLT, passive module 2 and interior DWDM Wavelength division multiplexer/demultiplexer 4 and the 6 formation outside cavity gas lasers of the ONU transmitter unit in the ONU of RN.
Described passive module 1 is made up of two identical first wavelength division multiplex device 7, second wavelength division multiplex device 8 and partial reflection part transmission devices 9 with passive module 2, and partial reflection part transmission device 9 is connected with second wavelength division multiplex device, 8 usefulness optical fiber with first wavelength division multiplex device 7.
Described ONU transmitter unit 6 is made of the 3rd wavelength division multiplexer 10, ballistic device 11 and detector 12, and the formation single fiber bi-directional transmitting-receiving unification device that is packaged together.
Described OLT Transmit-Receive Unit 5 is made of the 3rd wavelength division multiplexer 13, ballistic device 14 and detector 15, and the formation single fiber bi-directional transmitting-receiving unification device that is packaged together.
Fig. 3 is to be the outside cavity gas laser structure of the present invention of example with an ONU unit.
ONU ballistic device 11 adopts reflection type semiconductor image intensifers (RSOA), also can adopt semiconductor optical amplifier to add a reflection device, and perhaps semiconductor laser chamber face plates enough low anti-reflection film and makes it to swash and penetrate.ONU ballistic device 11 is by a chamber of noise spectra of semiconductor lasers face plating high-reflecting film, and another one chamber face plating anti-reflection film is realized, and is packaged into coaxial form.RSOA can realize high-gain to the light of λ u wave band.Detector 12 adopts common InGaAs detector, can survey the light signal of C/L wave band.
First wavelength division multiplex device 7, second wavelength division multiplex device 8, the 3rd wavelength division multiplexer 10 all are the wavelength division multiplexers that C-band and L-band light signal are separated.Wherein first wavelength division multiplex device 7 and second wavelength division multiplex device 8 adopt the wavelength division multiplexing optical fibre device of now having widely applied.The 3rd wavelength division multiplexer 10 adopts the wavelength division multiplexing diaphragm, and being packaged together with ballistic device 11 and ONU detector 12 constitutes single fiber bi-directional transmitting-receiving unification device.The effect of three wavelength division multiplexers is with upward signal and downstream signal separately or close ripple.Wherein first wavelength division multiplex device 7 and 8 pairings of second wavelength division multiplex device are used so that add the saturating device 9 of the anti-part of part on up light path, and downstream signal is not changed.
The saturating device 9 of the anti-part of λ u part is meant that the light to upward signal wave band λ u has the function of partial reflection part transmission, also adopt partial reflection part transmission diaphragm to encapsulate and be coupled into optical fibre device, convenience is connected with first wavelength division multiplex device 7 and second wavelength division multiplex device 8.Connection between the optical fiber can adopt ring flange to connect or directly fusing mode realization.
DWDM Wavelength division multiplexer/demultiplexer 4 adopts the multichannel DWDM device of array waveguide grating (AWG) form.
As shown in Figure 3, after downstream signal λ d enters passive module 2, behind first wavelength division multiplex device 7, separate with upward signal λ u, in passive module 2, downstream signal λ d and upward signal λ u behind second wavelength division multiplex device 8, DWDM Wavelength division multiplexer/demultiplexer 4, the 3rd wavelength division multiplexer 10, enter detector 12 again without same optical fiber.Detect downstream signal by detector 12 and demodulator circuit.
On the upward signal λ u light path, we have added an optical device 9 to the transmission of λ u partial reflection part in passive module 2.Optical device 9 has constituted resonant cavity as the outgoing chamber face of outside cavity gas laser with RSOA like this.DWDM Wavelength division multiplexer/demultiplexer 4 then becomes the modeling element of resonant cavity, and its wavelength has determined the excitation wavelength of this outside cavity gas laser, and RSOA becomes the gain media of resonant cavity.Under the condition of this outside cavity gas laser parameter of appropriate design, can realize penetrating like this by the DWDM wavelength of Wavelength division multiplexer/demultiplexer 4 decisions is sharp.Can realize the modulation and the generation of upward signal by changing the RSOA electric current.Upward signal enters Transmission Fibers from partial reflection part transmission device 9 output backs by first wavelength division multiplex device 7 and is up to the OLT unit.
Fig. 4 is to be the outside cavity gas laser structure of the present invention of example with an OLT unit.
OLT ballistic device 14 adopts reflection type semiconductor image intensifer (RSOA).This device is the same with ONU ballistic device 11 among Fig. 3, and by a chamber of noise spectra of semiconductor lasers face plating high-reflecting film, another one chamber face plating anti-reflection film is realized, and is packaged into coaxial form.RSOA can realize high-gain to the light of λ d wave band.Detector 15 adopts common InGaAs detector, can survey the light signal of C/L wave band.
First wavelength division multiplex device 7, second wavelength division multiplex device 8, the 3rd wavelength division multiplexer 13 all are the wavelength division multiplexers that C-band and L-band light signal are separated.Wherein first wavelength division multiplex device 7 and second wavelength division multiplex device 8 adopt the wavelength division multiplexing optical fibre device of now having widely applied.The 3rd wavelength division multiplexer 13 adopts the wavelength division multiplexing diaphragm, and being packaged together with ballistic device 14 and OLT detector 15 constitutes single fiber bi-directional transmitting-receiving unification device.The effect of three wavelength division multiplexers is with upward signal and downstream signal separately or close ripple.Wherein first wavelength division multiplex device 7 and 8 pairings of second wavelength division multiplex device are used so that add the saturating device 9 of the anti-part of part on descending light path, and upward signal is not changed.
The saturating device 9 of the anti-part of λ d part is meant that the light to upward signal wave band λ d has the function of partial reflection part transmission, also adopt partial reflection part transmission diaphragm to encapsulate and be coupled into optical fibre device, convenience is connected with first wavelength division multiplex device 7 and second wavelength division multiplex device 8.Connection between the optical fiber can adopt ring flange to connect or directly fusing mode realization.
DWDM Wavelength division multiplexer/demultiplexer 3 adopts the multichannel DWDM device of array waveguide grating (AWG) form.
As shown in Figure 4, after upward signal λ u enters passive module 1, behind first wavelength division multiplex device 7, separate with downstream signal λ d, in passive module 1, downstream signal λ d and upward signal λ u behind second wavelength division multiplex device 8, DWDM Wavelength division multiplexer/demultiplexer 3, the 3rd wavelength division multiplexer 13, enter detector 15 again without same optical fiber.Detect upward signal by detector 15 and demodulator circuit.
On the downstream signal λ d light path, we have added an optical device 9 to the transmission of λ d partial reflection part in passive module 1.Optical device 9 has constituted resonant cavity as the outgoing chamber face of outside cavity gas laser with RSOA like this.DWDM Wavelength division multiplexer/demultiplexer 3 then becomes the modeling element of resonant cavity, and its wavelength has determined the excitation wavelength of this outside cavity gas laser, and RSOA becomes the gain media of resonant cavity.Under the condition of this outside cavity gas laser parameter of appropriate design, can realize penetrating like this by the DWDM wavelength of Wavelength division multiplexer/demultiplexer 3 decisions is sharp.Can realize the modulation and the generation of downstream signal by changing the RSOA electric current.Downstream signal enters Transmission Fibers from partial reflection part transmission device 9 output backs by first wavelength division multiplex device 7 and goes downwards to the RN unit.
Claims (8)
1. outside cavity gas laser that can be used as the WDM-PON light source, by optical line terminal OLT, distant-end node RN, optical network unit ONU and Transmission Fibers are formed, it is characterized in that: in OLT, establish passive module (1), in RN, establish passive module (2), the interior passive module (2) of passive module (1) and RN is respectively by first wavelength division multiplex device (7) in the OLT, second wavelength division multiplex device (8) and a partial reflection part transmission device (9) are formed, first wavelength division multiplex device (7) is two kinds of identical devices with second wavelength division multiplex device (8), partial reflection part transmission device (9) is connected with optical fiber with second wavelength division multiplex device (8) with first wavelength division multiplex device (7), partial reflection part transmission device (9) in the OLT in the passive module (1) is arranged on the downlink optical fiber light path between first wavelength division multiplex device (7) and second wavelength division multiplex device (8), and the partial reflection part transmission device (9) in the interior passive module (2) of RN is arranged on the uplink optical fibers light path between first wavelength division multiplex device (7) and second wavelength division multiplex device (8); DWDM Wavelength division multiplexer/demultiplexer (3) in the OLT in passive module (1) and the OLT and OLT Transmit-Receive Unit (5) formation outside cavity gas laser, passive module (2) and interior DWDM Wavelength division multiplexer/demultiplexer (4) and the formation of the ONU transmitter unit (6) in the ONU outside cavity gas laser of RN in the RN; ONU transmitter unit (6) is made of ONU the 3rd wavelength division multiplexer (10), ONU ballistic device (11) and ONU detector (12), and the formation single fiber bi-directional transmitting-receiving unification device that is packaged together; OLT Transmit-Receive Unit (5) is made of OLT the 3rd wavelength division multiplexer (13), OLT ballistic device (14) and OLT detector (15), and the formation single fiber bi-directional transmitting-receiving unification device that is packaged together.
2. a kind of outside cavity gas laser that can be used as the WDM-PON light source as claimed in claim 1, it is characterized in that ONU ballistic device (11) and OLT ballistic device (14) are that reflection type semiconductor image intensifer, semiconductor optical amplifier add a reflection device, perhaps semiconductor laser chamber face plates enough low anti-reflection film and makes it to swash and penetrate.
3. a kind of outside cavity gas laser that can be used as the WDM-PON light source as claimed in claim 1, it is characterized in that ONU ballistic device (11) and OLT ballistic device (14) adopt the reflection type semiconductor image intensifer, a chamber of semiconductor optical amplifier face plating high-reflecting film, another one chamber face plating anti-reflection film, and be packaged into coaxial form.
4. a kind of outside cavity gas laser that can be used as the WDM-PON light source as claimed in claim 1 is characterized in that ONU detector (12) and OLT detector (15) are the InGaAs detectors.
5. a kind of outside cavity gas laser that can be used as the WDM-PON light source as claimed in claim 1 is characterized in that interior DWDM Wavelength division multiplexer/demultiplexer (3) of OLT and the interior DWDM Wavelength division multiplexer/demultiplexer (4) of RN adopt the multichannel DWDM device of array waveguide grating form.
6. a kind of outside cavity gas laser that can be used as the WDM-PON light source as claimed in claim 1, it is characterized in that first wavelength division multiplex device (7) and second wavelength division multiplex device (8) are the wavelength division multiplexing optical fibre devices, wavelength division multiplex device adopts diaphragm plated film or optical fiber pyrometric cone mode to realize.
7. a kind of outside cavity gas laser that can be used as the WDM-PON light source as claimed in claim 1 is characterized in that the 3rd wavelength division multiplexer (10) and the 3rd wavelength division multiplexer (13) among the OLT among the ONU adopts the wavelength division multiplexing diaphragm.
8. a kind of outside cavity gas laser that can be used as the WDM-PON light source as claimed in claim 1 is characterized in that partial reflection part transmission device (9) realizes by plating partial reflection part transmission optics film.
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| EP2731211A1 (en) * | 2011-07-27 | 2014-05-14 | Huawei Technologies Co., Ltd. | Self-seeding fiber laser device and driving method thereof, passive optical network system and device |
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| CN101729949B (en) * | 2009-12-21 | 2013-06-19 | 烽火通信科技股份有限公司 | WDM PON device with dynamically allocable wavelengths |
| US8774630B2 (en) * | 2010-10-15 | 2014-07-08 | Futurewei Technologies, Inc. | Method, apparatus, and system for a self-seeded external cavity laser for dense wavelength division multiplexing applications |
| SG194545A1 (en) | 2011-04-22 | 2013-12-30 | Huawei Tech Co Ltd | Optical transceiver apparatus and wavelength division multiplexing passive optical network system |
| CN107959529A (en) * | 2016-10-17 | 2018-04-24 | 山东华云光电技术有限公司 | The adjustable light module and communication means of Auto-matching wavelength |
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| CN101032100A (en) * | 2005-08-09 | 2007-09-05 | 韩国科学技术院 | Long-reach wavelength division multiplexing passive optical networks by using the position adjustment of broadband light source |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2731211A1 (en) * | 2011-07-27 | 2014-05-14 | Huawei Technologies Co., Ltd. | Self-seeding fiber laser device and driving method thereof, passive optical network system and device |
| EP2731211A4 (en) * | 2011-07-27 | 2014-10-15 | Huawei Tech Co Ltd | Self-seeding fiber laser device and driving method thereof, passive optical network system and device |
| US9059563B2 (en) | 2011-07-27 | 2015-06-16 | Huawei Technologies Co., Ltd. | Self-seeding fiber laser, method for driving self-seeding fiber laser, passive optical network system and device |
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